Rotary cutter



June 24, 1930.

. ROTARY CUTTER Filed May 11,1926

ATTORNEY F. P. MILLER 7 1,768,132

Patented June 24, 1930 FRANK IP. MILLER, 03 MEAIDVILLE, PENNSYLVANIA Aren't mm ROTARY CUTTER Application filed May 11,

This invention relates to rotary cutters such as milling cutters, reamers, tool holders for lathes, counter-bores and the like, and an important object is to provide simple and easily adjusted means to hold the inserted blades firmly in place during the use of the cutter. 4 7

A further object is to provide an inserted blade rotary cutter in which wear may be easily compensated for and in which the blades are held against longitudinal and edgewise movement.

Other objects and advantages will be apparent during the course of the accompanying description.

In the accompanying drawings forming a part of this application and in which like numerals are employed to designate like parts throughout the same.-

Figure 1 is a perspective of a rotary cutter embodying the invention;

Figure 2 is a detail sectional view through the same illustrating one of the cutters and the retaining means therefor;

Figure 3 is a detail transverse sectional View illustrating the cutters and the retaining means therefor. V y 1 In the drawing, the body of the cutter is designated by the numeral 15 and is provided with a series of grooves 16 for the reception of blades 17, the sides of which are inclined inwardly to correspond to the.

inclination of and to flatly contact with the, side walls of the grooves 16 as clearly shown in Figure 8. An inspection of this figure will show that when the blades 17 are forced inwardly the side walls of the same will be flatly engaged with the side walls of the grooves 16 to firmly seat the blades. In this connection it is noted that the inner edges of the blades 17 are spaced from the bottom walls of the grooves 16.

The blades may be forced into seating engagement with the side walls of the grooves by a longitudinally tapered wedge pin 18 adapted to be received in grooves 19 and 20 in opposed sides of the blades and the groove walls respectively. Figure 3 illustrates that the grooves 19 and 20 are staggered in a manner to bring about the 1926. Serial No. 108,297.

engagement of the wedge pins with the outer walls of the grooves 20 and the inner walls of the grooves 19.

In other words, the blades and the carrier may be said to have spaced opposed shoulders between which the tapered wedge pin 18 is driven to force the blades inwardly t firmly seated positions. 1

In carrying out the invention the carrier is provided with openings which intersect the inner portions of the grooves 16 and receive pins 22, the inner portions of the pins being extended through suitable notches 24' in the inner edge portions of the blades to take the end thrust. It will be seen that when the blades 22 have been inserted, it is not necessary to disturb the same preparatory to either removing or'applying the blades. This is true for the reason that the removal of the wedge pin 18'per' mits the blade to be detached radially.

Attentionis invited to Figure 6 which illustrates" that it is the intermediate portions of the thrust pins 22 that have engagement with the blades 14 thereby allowing the opposite ends of the-thrust pins to have firm engagement with the body. By

this arrangement the thrust pins are better able to withstand the thrust from the blades. I

In the use of the improved-rotary cutter it is a simple matter toinsert the blades and adjust thesame to the desired cutting posi-' tions and to then 'drivethe wedgepins 18 into place and thereby lock the blades against edgewise movement. As previously stated, the pins 22 take the longitudinal thrust. Having thus described the invention, what is claimed is 1. A rotary cutter comprising a carrier. having grooves, blades adjustable in the grooves and having the inner edge portions thereof provided with notches, thrust pins having their intermediate portions intersecting said grooves and snugly received in said notches, the opposite ends of the thrust V pins being firmly anchored tothe carrier;

I 2. A cutter comprising .a'body havinga groove, a blade in the groove, the groove and the bladehaving converging side Walls, certain of which are provided With opposed converging shoulders, and a Wedging key engaged With said converging shoulders. 3. A cutter comprising a body having a groove, a blade in the groove, the groove and the blade having converging side Walls, cer tain of Which are provided Wit-h converging shoulders extending substantially length- 10 Wise thereof, a wedging key engaged With said converging shoulders, and a thrust pin in a plane approximately at right angles to the plane of the blade and having the intermediate portion thereof engaged With said blades'and having the ends anchored to said carrier; In testimony whereof I afliX my signature.

FRANK P. MILLER.

fso p i til l 

